A child goes down a water slide in a pool set up in Jongno-gu, Seoul, Sunday.

Heat advisories have been in effect nationwide as the weather agency warned people to avoid vigorous outdoor activities. Soaring temperatures have seen an increase in the number of patients with heat-related illnesses.

Over 1,000 patients with heat-related diseases and 17 fatalities were reported between May 20 and July 24.

Photos by YonhapWritten by Chyung Eun-ju

Children play with water near the Han River in Yeouido, Seoul, Sunday.

Around 450,000 people flock to beaches at Haeundae, Busan, Saturday.

Visitors watch a flyboarding show at Caribbean Bay in Yongin, Gyeonggi Province, Sunday.